google.golang.org/protobuf v1.26.0-rc.1

# Verification of google.golang.org/protobuf v1.26.0-rc.1 prototext APIs

This clean-room sample verifies the `google.golang.org/protobuf/encoding/prototext` package in `google.golang.org/protobuf@v1.26.0-rc.1`:
- `prototext.Marshal` and `prototext.Unmarshal` round-trip serialization of protobuf messages
- `prototext.Format` human-readable multiline formatting of protobuf messages
- `prototext.MarshalOptions` with `Multiline` and `Indent` formatting of nested message fields
- `prototext.MarshalOptions` with `EmitASCII` escaping non-ASCII characters into octal escape sequences
- `prototext.UnmarshalOptions` with `DiscardUnknown` ignoring unknown fields without errors
- `prototext.Unmarshal` error reporting on syntax violations and malformed textproto data

All tests execute offline without network dependencies.

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:golang/google.golang.org/protobuf@v1.26.0-rc.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/protobuf@v1.26.0-rc.1

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:77cb1134889651fe1021b1e9dba8ab53c4c185b31b929a1937157f753da09ca4","contract":["prototext.Marshal and prototext.Unmarshal correctly round-trip protobuf messages","prototext.Format produces multiline human-readable text representation of protobuf messages","prototext.MarshalOptions with Multiline and Indent formats nested messages with custom indentation","prototext.MarshalOptions with EmitASCII escapes non-ASCII characters into octal escape sequences","prototext.UnmarshalOptions with DiscardUnknown ignores unrecognized fields while retaining known fields","prototext.Unmarshal returns an error when encountering malformed textproto syntax"],"goal":"verify pkg:golang/google.golang.org/protobuf@v1.26.0-rc.1","kind":"HOW","packages":["pkg:golang/google.golang.org/protobuf@v1.26.0-rc.1"],"schemaVersion":1},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/google.golang.org/protobuf@v1.26.0-rc.1"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/protobuf@v1.26.0-rc.1","verifierAdapter":"golang@1"}

module sample

go 1.23

require google.golang.org/protobuf v1.26.0-rc.1

github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/protobuf v1.26.0-rc.1 h1:7QnIQpGRHE5RnLKnESfDoxm2dTapTZua5a0kS0A+VXQ=
google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=

package main

import (
	"fmt"

	"google.golang.org/protobuf/encoding/prototext"
	"google.golang.org/protobuf/types/known/durationpb"
	"google.golang.org/protobuf/types/known/timestamppb"
	"google.golang.org/protobuf/types/known/wrapperspb"
)

// ServiceConfig represents application configuration using standard protobuf types.
type ServiceConfig struct {
	Timeout   *durationpb.Duration
	UpdatedAt *timestamppb.Timestamp
	AppName   *wrapperspb.StringValue
}

// FormatConfig returns formatted textproto representation of the service configuration.
func FormatConfig(cfg *ServiceConfig) (string, error) {
	if cfg == nil || cfg.Timeout == nil {
		return "", fmt.Errorf("invalid config")
	}
	opts := prototext.MarshalOptions{
		Multiline: true,
		Indent:    "  ",
	}
	data, err := opts.Marshal(cfg.Timeout)
	if err != nil {
		return "", fmt.Errorf("marshal timeout failed: %w", err)
	}
	return string(data), nil
}

func main() {
	dur := durationpb.New(30 * 1000 * 1000 * 1000) // 30s
	ts := timestamppb.Now()
	name := wrapperspb.String("csx-service")

	cfg := &ServiceConfig{
		Timeout:   dur,
		UpdatedAt: ts,
		AppName:   name,
	}

	formatted, err := FormatConfig(cfg)
	if err != nil {
		panic(err)
	}
	fmt.Printf("Config Textproto:\n%s\n", formatted)
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/google.golang.org/protobuf@v1.26.0-rc.1",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/protobuf@v1.26.0-rc.1"
  ]
}

package main

import (
	"bytes"
	"fmt"
	"os"
	"strings"

	"google.golang.org/protobuf/encoding/prototext"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/anypb"
	"google.golang.org/protobuf/types/known/durationpb"
	"google.golang.org/protobuf/types/known/timestamppb"
	"google.golang.org/protobuf/types/known/wrapperspb"
)

func main() {
	// Assertion 1: prototext.Marshal and prototext.Unmarshal correctly round-trip protobuf messages
	{
		orig := &timestamppb.Timestamp{
			Seconds: 1700000000,
			Nanos:   500000,
		}
		data, err := prototext.Marshal(orig)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: prototext.Marshal error: %v\n", err)
			os.Exit(1)
		}
		if len(data) == 0 {
			fmt.Fprintf(os.Stderr, "FAIL: prototext.Marshal returned empty data\n")
			os.Exit(1)
		}

		var decoded timestamppb.Timestamp
		if err := prototext.Unmarshal(data, &decoded); err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: prototext.Unmarshal error: %v\n", err)
			os.Exit(1)
		}
		if !proto.Equal(orig, &decoded) {
			fmt.Fprintf(os.Stderr, "FAIL: unmarshaled message does not equal original\n")
			os.Exit(1)
		}
	}

	// Assertion 2: prototext.Format produces multiline human-readable text representation of protobuf messages
	{
		msg := &durationpb.Duration{
			Seconds: 3600,
			Nanos:   250000,
		}
		formatted := prototext.Format(msg)
		if !strings.Contains(formatted, "\n") {
			fmt.Fprintf(os.Stderr, "FAIL: prototext.Format should contain newlines\n")
			os.Exit(1)
		}
		if !strings.Contains(formatted, "3600") || !strings.Contains(formatted, "250000") {
			fmt.Fprintf(os.Stderr, "FAIL: prototext.Format output missing field values: %s\n", formatted)
			os.Exit(1)
		}
	}

	// Assertion 3: prototext.MarshalOptions with Multiline and Indent formats nested messages with custom indentation
	{
		inner := &timestamppb.Timestamp{
			Seconds: 1609459200,
			Nanos:   123456,
		}
		anyMsg, err := anypb.New(inner)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: anypb.New error: %v\n", err)
			os.Exit(1)
		}

		opts := prototext.MarshalOptions{
			Multiline: true,
			Indent:    "  ",
		}
		data, err := opts.Marshal(anyMsg)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: opts.Marshal error: %v\n", err)
			os.Exit(1)
		}
		if !bytes.Contains(data, []byte("  seconds:  1609459200")) {
			fmt.Fprintf(os.Stderr, "FAIL: output does not contain expected indented field: %s\n", string(data))
			os.Exit(1)
		}
	}

	// Assertion 4: prototext.MarshalOptions with EmitASCII escapes non-ASCII characters into octal escape sequences
	{
		msg := wrapperspb.String("unicode: 안녕하세요")
		asciiOpts := prototext.MarshalOptions{EmitASCII: true}
		data, err := asciiOpts.Marshal(msg)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: asciiOpts.Marshal error: %v\n", err)
			os.Exit(1)
		}
		if strings.Contains(string(data), "안녕하세요") {
			fmt.Fprintf(os.Stderr, "FAIL: non-ASCII characters were not escaped: %s\n", string(data))
			os.Exit(1)
		}

		var decoded wrapperspb.StringValue
		if err := prototext.Unmarshal(data, &decoded); err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: prototext.Unmarshal failed for escaped ASCII data: %v\n", err)
			os.Exit(1)
		}
		if decoded.GetValue() != "unicode: 안녕하세요" {
			fmt.Fprintf(os.Stderr, "FAIL: decoded value mismatch: got %q, want %q\n", decoded.GetValue(), "unicode: 안녕하세요")
			os.Exit(1)
		}
	}

	// Assertion 5: prototext.UnmarshalOptions with DiscardUnknown ignores unrecognized fields while retaining known fields
	{
		inputWithUnknown := []byte("seconds: 450 nanos: 123 extra_unknown_field: 9999")
		var defaultTarget timestamppb.Timestamp
		if err := prototext.Unmarshal(inputWithUnknown, &defaultTarget); err == nil {
			fmt.Fprintf(os.Stderr, "FAIL: default prototext.Unmarshal should reject unknown fields\n")
			os.Exit(1)
		}

		var discardTarget timestamppb.Timestamp
		discardOpts := prototext.UnmarshalOptions{DiscardUnknown: true}
		if err := discardOpts.Unmarshal(inputWithUnknown, &discardTarget); err != nil {
			fmt.Fprintf(os.Stderr, "FAIL: discardOpts.Unmarshal failed on unknown fields: %v\n", err)
			os.Exit(1)
		}
		if discardTarget.Seconds != 450 || discardTarget.Nanos != 123 {
			fmt.Fprintf(os.Stderr, "FAIL: discardOpts parsed values mismatch: seconds=%d, nanos=%d\n", discardTarget.Seconds, discardTarget.Nanos)
			os.Exit(1)
		}
	}

	// Assertion 6: prototext.Unmarshal returns an error when encountering malformed textproto syntax
	{
		malformedInput := []byte("seconds: {invalid bracket syntax")
		var target timestamppb.Timestamp
		if err := prototext.Unmarshal(malformedInput, &target); err == nil {
			fmt.Fprintf(os.Stderr, "FAIL: prototext.Unmarshal should return error on malformed input\n")
			os.Exit(1)
		}
	}

	fmt.Println("CONTRACT_PASS")
}